We highly doubt her Starboy is cool with this anymore!

Selena Gomez spent her Sunday with Justin Bieber at his LA rental pad, and it was just the two of them this time! Their previous get together was at the "Come & Get It" songstress' Studio City home, and that meet up was with mutual pals. We're on to them, and we're starting to wonder if she and The Weeknd have already called it quits?

The pair grabbed breakast at a local cafe before attending church, and with their "friendship" heating up, we think it's only a matter of time before they're full-on back together. They allegedly got back into contact after SG's kidney transplant this summer, and nobody on the brunette beauty's side is happy about it.

A source tells X17:
    "Everyone is really uneasy that Bieber has weaseled his way back into her good graces. He put her through a lot and treated her terribly when they dated, and they worry that she's going to fall under his spell again. He says he just wants to be friends, but everyone close to her knows he is trying to get her back."

Her Bieber fever is incurable, apparently!